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11. High Performance Primitive Collections303 usages

com.carrotsearch » hppcApache

High Performance Primitive Collections: data structures (maps, sets, lists, stacks, queues) generated for combinations of object and primitive types to conserve JVM memory and speed up execution.
Last Release on Jun 4, 2024

12. ConcurrentLinkedHashMap279 usages

com.googlecode.concurrentlinkedhashmap » concurrentlinkedhashmap-lruApache

A high performance version of java.util.LinkedHashMap for use as a software cache.
Last Release on Jan 28, 2015

13. Kotlinx Collections Immutable243 usages

org.jetbrains.kotlinx » kotlinx-collections-immutableApache

Kotlin Immutable Collections multiplatform library
Last Release on May 14, 2025

14. Scala Parallel Collections240 usages

org.scala-lang.modules » scala-parallel-collectionsApache

scala-parallel-collections
Last Release on Jan 7, 2025

15. RoaringBitmap229 usages

org.roaringbitmap » RoaringBitmapApache

Roaring bitmaps are compressed bitmaps (also called bitsets) which tend to outperform conventional compressed bitmaps such as WAH or Concise.
Last Release on Sep 17, 2024

16. GNU Trove153 usages

trove » troveLGPL

High performance collections for Java
Last Release on Nov 8, 2005

Relocated → net.sf.trove4j » trove4j

17. Highly Scalable Java136 usages

com.github.stephenc.high-scale-lib » high-scale-libCC0Public

Highly Scalable Java
Last Release on Nov 28, 2011

18. Larvalabs Collections126 usages

net.sourceforge.collections » collections-genericApache

Larvalabs Collections
Last Release on Feb 12, 2007

19. Trove (core)119 usages

net.sf.trove4j » coreLGPL

High performance collections for Java
Last Release on Aug 3, 2018

20. Google Collections Bundle113 usages

com.atlassian.bundles » google-collectionsApache

Google Collections with OSGi manifest entries
Last Release on Sep 24, 2024

Relocated → com.google.guava » guava